1,3-Dipolar cycloaddition of diazomethane and diazocyclopropane to 2-fluoro-3-methylbutadiene and thermal transformations of fluorine-containing vinylpyrazolines and vinylcyclopropanes
作者:E. V. Guseva、N. V. Volchkov、E. V. Shulishov、Yu. V. Tomilov、O. M. Nefedov
DOI:10.1023/b:rucb.0000042293.15892.9a
日期:2004.6
conditions (400—600 °C), into 1-fluoro-2-methylcyclopent-1-ene and 5-fluoro-4-methylspiro[2.4]hept-4-ene (7), respectively. Spiropentane derivative 5 partially isomerizes into 1-fluoro-2-methyl-3-methylidenecyclohex-1-ene. In a similar way, thermolysis of 6-(2,3,3-trifluorocyclobut-1-enyl)-4,5-diazaspiro[2.4]hept-4-ene at 400 °C gives a mixture of 1-(spiropentyl)-2,3,3-trifluorocyclobut-1-ene and 2,3,3
2-氟-3-甲基丁-1,3-二烯与重氮甲烷在乙醚中的反应,温度为 15 °C,并与通过在 K2CO3 的 CH2Cl2 中在 –10 °C 下分解 N-环丙基-N-亚硝基脲原位生成的重氮环丙烷反应C 选择性地涉及甲基上的双键,得到 3-(1-氟乙烯基)-3-甲基吡唑啉。后者在 250 °C 下热脱重氮化产生 1-(1-fluorovinyl)-1-methylcyclopropane 和 -spiropentane 5,它们能够在更严酷的条件下 (400-600 °C) 异构化成 1-fluoro-2 -methylcyclopent-1-ene 和 5-fluoro-4-methylspiro[2.4]hept-4-ene (7),分别。螺戊烷衍生物 5 部分异构化为 1-fluoro-2-methyl-3-methylidenecyclohex-1-ene。以类似的方式,6-(2,3,